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bacterial bloom

  1. Could this be the cause of repeated bacterial blooms?

    Freshwater and Tropical Fish
    I have a 75 gallon, planted tank that has been up and running for nearly 4 years. My first experience with bacterial bloom came a few months ago, and I am just not sure what the cause is. Here is what it is NOT from: I change 40-50% water weekly; have done so for years I vacuum the substrate...
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